New L755-S5214..Mistake in password set up! Please HeLp!

I'm thinking there is an easy solution to this, at least I hope, but I just don't know what to do.

While setting up my new computer, I came to the point of setting the password to lock the system. I entered my desired password, entered it a second time to confirm, then it asked me to type a clue in case I forgot the password. I started typing the clue, but since I'm not used to the keyboard on this computer yet, I accidentally hit enter instead of the apostrophe key. The computer then immediately went into the admin lock mode and I needed to enter the password I just typed. I did, and it tells me that I entered the wrong password. It is highly likely that I possibly typed it wrong since it was setting this up late at night and lights were off. I've tried every possible password that I could have entered even if it was mistyped. HOW can I now get into my computer? I did create a back up on a jump drive BEFORE I did the password. I tried to use that to get in, but it tells me I need to original password in order to change it. Need help ASAP please!!

Re: New L755-S5214..Mistake in password set up! Please HeLp!

Thank you Jerry. I'm not much of a techie, so the link I went to that you provided looked great, but as I dug into it it was all way over my head...and quite frankly....terrifying! I hate for someone to have to hold my hand, but can you tell me what to do in plain English? I don't know what it means to boot the computer from a CD or USB and how to do that. Sorry...another way around??